Brunel's advanced Warrior matters because the yards make it repeatable

How plausible is an Isambard Kingdom Brunel-designed advanced Warrior, and how would other navies respond?

The ship becomes plausible if Brunel first builds oversized, forward-looking naval yards, and that repeatable capacity would alarm rivals by enabling much larger future British capital ships.

An advanced Warrior attributed to Brunel would be more than a one-off giant ironclad. Brunel would likely approach the problem as surveyor of the navy's yards and build the slips, docks, and production facilities required to make the ship possible. He would size that infrastructure for the warships Britain wanted next instead of limiting it to the fleet already in service. Once those constraints disappeared, a very large ironclad could become the first step in a repeatable construction path rather than an isolated experiment. Rival navies would react to Britain's enlarged industrial capacity as much as to the initial ship, because later dreadnought-era hulls could begin at dimensions other fleets still struggled to accommodate.